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El Complejo Calco-Alcalino de la Serra da Neve (SW Angola): trabajos en curso [Resumo]
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Advisor(s)
Abstract(s)
RESUMEN: El Complejo Calco-Alcalino de la Serra da Neve (CACSN) constituye un conjunto de estructuras
alcalinas volcánicas, subvolcánicas y plutónicas emplazadas en una tendencia general ONO-ESE a NOSE
(Pereira y Moreira, 1978; Lopes y Caessa, 2021). Fue remapeado a escala 1:100.000 para la cartografía geológica del proyecto PLANAGEO y posteriormente fue una de las áreas seleccionadas para realizar exploración mineral para ETR-Nb-Ta a escala regional. Las campañas de campo incluyeron levantamientos con FRX portátil y SRG portátil, cuyos resultados mostraron patrones preliminares de distribución de ETR en las litologías del CACSN (Prazeres et al., en revisión). Los muestreos realizados durante el trabajo de campo permitieron estudios petrográficos y análisis con microsonda electrónica, que son la base para comprender la mineralogía de los ETR. Hasta ahora se ha demostrado que algunos carbonatos (bastnasita), fosfatos (apatito y xenotima), minerales de Zr (eudialita) y esfena incorporan cantidades apreciables de ETR, especialmente ETR ligeros.
ABSTRACT: The Serra da Neve Calc-Alkaline Complex (SNCAC) constitutes a set of volcanic, subvolcanic and plutonic alkaline structures emplaced in an overall WNW-ESE to NW-SE trend (Pereira and Moreira, 1978; Lopes and Caessa, 2021). It was remapped at the 1:100,000 scale for the geological mapping in the PLANAGEO project and subsequently it was one of the areas selected to undergo mineral exploration for REE-Nb-Ta at a regional scale. Field campaigns included portable XRF and portable GRS surveys, which have showed preliminary distribution patterns of REE in the SNCAC lithologies (Prazeres et al., under review). Sampling performed during field work allowed for petrographic studies and electron microprobe analysis, which are the basis for understanding the REE-bearing mineralogy. So far, carbonates (bastnasite), phosphates (apatite and xenotime), Zr minerals (eudyalite) and sphene have been shown to incorporate significant amounts of REE, especially light REE.
ABSTRACT: The Serra da Neve Calc-Alkaline Complex (SNCAC) constitutes a set of volcanic, subvolcanic and plutonic alkaline structures emplaced in an overall WNW-ESE to NW-SE trend (Pereira and Moreira, 1978; Lopes and Caessa, 2021). It was remapped at the 1:100,000 scale for the geological mapping in the PLANAGEO project and subsequently it was one of the areas selected to undergo mineral exploration for REE-Nb-Ta at a regional scale. Field campaigns included portable XRF and portable GRS surveys, which have showed preliminary distribution patterns of REE in the SNCAC lithologies (Prazeres et al., under review). Sampling performed during field work allowed for petrographic studies and electron microprobe analysis, which are the basis for understanding the REE-bearing mineralogy. So far, carbonates (bastnasite), phosphates (apatite and xenotime), Zr minerals (eudyalite) and sphene have been shown to incorporate significant amounts of REE, especially light REE.
Description
Keywords
Mineralogy Mineral resources Serra da Neve Angola Planageo
Citation
Prazeres, C., Batista, M.J., Lopes, R., Barros, B., Ferreira da Costa, P., Labaredas, J., Guimarães, F., Rodrigues, J.F. & Cordeiro, D. (2024) El Complejo Calco-Alcalino de la Serra da Neve (SW Angola): trabajos en curso. In: Geo-Temas, vol. 20, XI Congresso Geológico de España, Ávila, España, 2-6 July, 2024, p. 1356